To qualify as a diner, it must be a prefabriacted structure with a counter and stools which swivel and are bolted to the floor. There are others who refine the distinction even further and insist on the judicious use of stainless steel, inside and out. Others require the place to be long and narrow, and not too big.

Info:
Since this is somewhat a small file (300+ entries), I did not break it into states but you will be able to pick them out yourself since the address is in the comments section.